Thank you once again Mark!
I haven't had a chance to try that out, the till is now with our chairman.

I was so close to correcting the error on the night without the manual. I tried CLK followed by 1, instead of 1 followed by CLK!
I'm not sure I would have got it right WITH the manual.

I'm off on holiday now for two weeks, so all thoughts of cash registers will be forgotten, though I could be putting a lot of money in them.

David